Cambodian journalist Thet Sambath goes tramping through the farmyards, scattering the chickens, in search of ghosts. "We're making a documentary," he explains by way of introduction, although at times his film about the 1970s killing fields veers alarmingly close to an exorcism. Sambath's own family were butchered by the Khmer Rouge and his quiet, respectful inquiries flush out all manner of alarming confessions. One farmer sheepishly recalls how he "slit so many throats" that his hand cramped up. Another points to where the corpses were dumped in the paddy-fields and remembers how they bubbled as they decomposed. This extraordinary film brings them back to the surface.